I must define number be for subsubsection form :
\chapter : 1
\section : 1.1
\subsection : 1.1.1
\subsubsection : 1.1.1.a
Can you help me define form.
[Tex/LaTex] Define number in \subsection in book class
numberingsectioningtitlesec
Related Solutions
Use the first optional argument for \newtheorem:
\documentclass{book}
\usepackage{amsthm}
\newtheorem{theo}[subsubsection]{Theorem}
\newtheorem{defi}[subsubsection]{Definition}
\setcounter{secnumdepth}{3}
\begin{document}
\chapter{Test Chapter}
\section{Test Section}
\subsection{Test Subsection}
\subsubsection{Test Subsubsection}
\begin{theo}
test.
\end{theo}
\subsubsection{Test Subsubsection}
\begin{theo}
test.
\end{theo}
\begin{defi}
test.
\end{defi}
\subsubsection{Test Subsubsection}
\end{document}
I think this numbering schema can result hard to follow for readers (among other things, what if, for example, there's a theorem or a definition before a subsubsection is created?).
For the bonus point (and to make things even harder for the reader):
\documentclass{book}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{etoolbox}
\numberwithin{equation}{subsection}
\newtheorem{theo}[subsubsection]{Theorem}
\newtheorem{defi}[subsubsection]{Definition}
\setcounter{secnumdepth}{3}
\AtBeginEnvironment{equation}{\setcounter{equation}{\value{subsubsection}}}{}{}{}
\AtEndEnvironment{equation}{\stepcounter{subsubsection}}{}{}{}
\begin{document}
\chapter{Test Chapter}
\section{Test Section}
\subsection{Test Subsection}
\subsubsection{Test Subsubsection}
\begin{theo}
test.
\end{theo}
\subsubsection{Test Subsubsection}
\begin{theo}
test.
\end{theo}
\begin{defi}
test.
\end{defi}
\begin{equation}
a=b.
\end{equation}
\subsubsection{Test Subsubsection}
\begin{equation}
c=d.
\end{equation}
\end{document}
I would rather use a simpler numbering schema:
\documentclass{book}
\usepackage{amsthm}
\usepackage{amsmath}
\newtheorem{theo}{Theorem}[chapter]
\newtheorem{defi}[theo]{Definition}
\newtheorem{prop}[theo]{Proposition}
\setcounter{secnumdepth}{3}
\begin{document}
...
\end{document}
You have to insert \setcounter{secnumdepth}{5} to your document preamble and then the command \paragraph{title} is the equivalent of what you mean by \subsubsubsection{title}.
But in my opinion is not a good idea to have numbered paragraphs nor numbered subsubsections. It makes the text much less readable.
\documentclass{report}
\setcounter{secnumdepth}{5} % seting level of numbering (default for "report" is 3). With ''-1'' you have non number also for chapters
%\setcounter{tocdepth}{5} % if you want all the levels in your table of contents
\begin{document}
\chapter{chapter title (depth 0)}
\section{section title (depth 1)}
\subsection{subsection title (depth 2)}
\subsubsection{subsubsection title (depth 3)}
\paragraph{paragraph title (depth 4)}
\subparagraph{Subparagraph title (depth 5)} % last existing level
\end{document}
Best Answer
The numbering of
subsections in thebookdocument class should already be in the format you require. To modify\thesubsubsectionto show the final "number" in alphabetical rather than arabic-numeral format, you could issue the commandsin the preamble of your document.
As you can probably tell from this definition,
\c@subsubsectionis a counter variable,\@alphinstructs TeX to display the value of the counter in lowercase-alphabetical format (a,b,c, etc), and\thesubsection.instructs TeX to prepend the (already-defined) representation of the subsection counter, followed by a dot (.), to\@alph\c@subsubsection.As @ThorstenDonig has pointed out in a comment, the preceding commands -- which are fairly low-level -- can be replaced with the following, higher-level command (which is especially nice at it obviates the need to use
\makeatletterand\makeatother):